Quoting the article :
Bitwarden upholds these standards through annual third-party security audits, conducted by external security experts like Cure53 and Insight Risk Consulting.
Quoting the report :
The overall impression from Cure53 is that Bitwarden, including the network infrastructure and web
applications that power the product, exhibits a strong security foundation with zero exploitable
vulnerabilities found. Four issues were discovered with Cure53 designating two being a low security
threat and the other two being designated as informational-only.